Training the Structured Forest from Pre-trained Model

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OpenCV provides a random forest pre-trained model for edge detection. The model can be downloaded from this link (model.yml.gz) . The related tutorial can be found here

I would like to continue to train the random forest using my limited image data. Training this random forest requires running the source code using MATLAB which can be found here.

Anyone knows how to do this? To be more precise, how to convert the pre-trained model (model.yml.gz) into a .mat format? Many Thanks